Hoisting-machine



1 G.,AUSTIN. H 0 isting-M.a,chin

/ No. 224,322. Patented Feb. 10, 1880.

I Yul.

WITNESSES. INVIENTOR.

N-PETERS. PHOTO-IJ'I'HDQRAPNER, WASHINGTON. D. c

UNITED STATES PATENT OF ICE.

JOSEPH e. AUSTIN, or CHICAGO, ILLINOIS;

H'Ol-STING- MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 224,322, dated February'10, 1880,

Application filed June 18, 1879.

To all whom it may concern X Be it known that I, JOSEPH G. AUSTIN, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Hoisting-Machines, of which the following is a specification, reference being had to the accompanying drawings, illustrating the improvement and made a part hereof, in which- Figure l is an elevation of a hoisting-Inachine embodying my improvement; Fig. 2, a plan or top'view of the locking devices and elevator-beam detached from the other devices the elevator. is supported and shown double the size of the same parts in Fig. 1 Fig. 3, an enlarged view of one of the slotted dogs removed from its guides, but showing its connection with the head of the draft-bar; Fig. 4, enlarged views of the guides to one, dog, taken transversely to the dog which operates therein; Fig. 5, anenlarged perspective view of the frame which supportsv and guides the draft-bar, and also is a support for the upper end of the spring which forces thedogs outward and into the notches of the rack.

The present invention relates to an improved safety lock for hand or steam hoisting-machines, whereby if the hoisting-rope should break the elevator would be securelylocked to the elevator-guides;

The particular improvement consists in slotted dogs pivoted to the head of the draw-bar and combined with guides to direct the dogs into notched racks, and with a spring and adjustable jam nut, wherebyvthe dogs may be adjusted to notchedv racks after they mayhave become worn, or to racks standinga greater or less distance from the elevator proper.

The advantage of this combination is that wholly on the adjustable nut, which controls the, position of the dogs in relation to the racks, and that there is no greater force on the coil-spring when raising one weight than another. f Y r My device differs from the elliptic spring, which straightens out to catch inthe notches of the racks, in that the pitchof the dogs is not such as to cause them to crowd with too great force against the guides; but there is suflicient pitch to enable the dogs to hold the to any ordinary amount spread.

A represents the lifting-beam of an ordinary hoisting-machine or elevator, and B are theelevator-guides. G O are the toothed or notched racks in which the locking device of the elevator is to catch in case that the hoisting-rope should break, all of which have the ordinary construction.

D represents aframe, piece of iron extending enough up to permit a coil-spring, E, to be placed within its walls, and also properly to guide the draftbar F and support it in a vertical position, a hole being made through the top of the frame for said bar to pass.

The lower part of the frame D is provided with flanges G G, which, by means of connecting rods or bolts H H, fasten to a strong iron plate, I, which is placed flatwise under the lifting-beam A, and projects laterally over .the sides, to permit the bolts H to pass through it. The bolts, fitting closely to the beam A, prevent the frame or platefrom turning out of place.

The draft-bar F passes through the liftingbeam A, and also through the plate I, and on the lower end of the bar isformed a screwthread, on-which a jam-nut, J, is placed'to sustain the weight of the elevator or platform.

Above the beam A is placed anut, K, between which and the top of frame is placed a coil-spring, E, of such strength as will insure the instantaneous movement of the dogs outward should the hoisting-rope L break.

A socket-head, M, is formed on the upper end of the draft-bar F, and to it are pivoted dogs N N at P, the ends of which have bearings against said head, so that the pivots are which is a continuous from the beam A far not wholly relied ones-supports against the pressure of the dogs endwise, as when engaging the racks. The middle portions of these dogs are provided withslots R, through which ,pins bfrom the guides S S-pass, and not only act as fulcrums for the dogs to turn on to some extent, but permit the dogs to have a longitudinal movement, both of said movements bein necessary to enable the dogs to enter the .notchesin the'racks G. G in case the cord or rope L should break. The outer guides, T T, not only direct the dogs at all times into the racks O 0, but they prevent the dogs from springing or being bent up by any sudden jar they may be liable to.

The slotted dogs N N, having fulcrums and The device is automatic in its operation as on pins b, in combination 15 constructed. The only attention required is to sliding movements turn up the nut J, so as to keep the outer ends with guides S S, draft-bar and head F M,

of the dogs N N as close to the racks O O as spring E, frame D, plate I, lifting-beam A, and 5 possible, but not so as to enter the notches in set-nut J, and jam-nut K, as and for the purthe movement of the elevator or platform. pose set forth.

The object of that position of the dogs in relation to the rack is that the dogs shall move JOSEPH Gr. AUSTIN.

the shortest possible distance to catch in the 10 notches of the rack in case the rope L should Witnesses:

break. G. L. OHAPIN,

I claim and desire to secure by Letters Pat- W. R. MANLOVE. ent 

